Can't quite describe the noise, but it seems to be coming from the serpentine area. Up close there's some rattling, but while driving it's more of a wheezing. My bet is one of the bearings driven by the belt. Seems to be up higher instead of lower, but that's just a brief observation. I put a new belt on maybe 15-20k miles ago. Tensioner was tight, took my whole weight on a 1 ft breaker bar going through the wheel well to move it easily. Assuming it's one of the other accessories, how easy is it to replace any of those things?
